Asphalt package and method of making the same



F. C. OV ERBURY.AND C. E. RAHR. ASPHALT PACKAGE AND METHOD OF MAKING THESAME.

' APPLICATION FILED MAY 8, 1918.- RENEWED MAR. 9.192]. 1,391,969.

PatentedSept. 27, 1921.,

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BROOIKLINE, MASSACHUSETTS, BOSTON,

PATENT OFFICE.-

I'REDER'ICK OVERBURY, 0F HILLSDALE, NEW

JERSEY, AND cnnsrnn. a man, or

ASSIGNOBS TO THE FLINTKOTE COMPANY, 01' MASSACHUSETTS, A CORPORATION OFMASSACHUSETTS.

Asnnam PACKAGE AND mnrnon or MAKING- THE sens.

Specification of Letters Patent.

Patented Sept. 2'7, 1921.

' Application filed May 8,1918, Serial No. 233,267. Renewed March 9,1921. Serial No, 450,937.

To all whom it may concern Be it known that We,-FREDERIOK C. OVER- BURYand CHESTER E. RAHR, citizens of the United States, residing,respectively, at l-Iillsdale, inthe countyof Bergen and State of NewJersey, and at Brookline, in the county of Norfolk and State ofMassachusetts, have invented new and-useful improve ments in As haltPackages and Methods of Making the ame, of which the following is aspecification.

This invention has for its object to provide for the packaging ofasphalt or like solidifying substances for shipment, so as to obviatethe use of metal drums or barrels which have heretofore been regarded asessential. The use of such containers ordinarily results in acomparatively large loss and wastage due to theadherence of the asphaltor .pitch tothe interior surfaces thereof, and entails anincreased costto the consumer on account of the cost of the container, the increasedcharges for transportation because of the weight-thereof, and the laborin removing the material from the container and handling the latter.

In accordance with the present invention, like material, whichsolidifies on cooling to ordinary temperatures, is poured while inmolten condition into an envelop consisting offlexible fibrous sheetmaterial and permitted to cool. and solidify. The asphalt adheres to theenvelop and is covered and rotected thereby, and a package is thus ormedwhich may be shipped to the consumer. We have found that, although.paper may be employed for this purpose, yet, to secure the best resultsand to save wastage, the paper should be waterproofe'd, and should becoated with a high-melting point pitch or asphalt or equivalentsubstance on the side which comes 1nto contact with the material to beprotected thereby. An envelop thus formed may be subse uently strippedfrom the solidified fusin as it were, with the body of the aspha t, sothat the sheet, on being stripped from the mass, comes away clean. Asthepaper, because of its-flexibility and lack of tensile strength, isincapable of withstandbe formed into a-tube mass without difiiculty, thecoating .of any suitable construction are em mold into which the mold isreferably made 1n such manner as to provi e for the radiatlon of theheat of the molten pitch or asphalt to insure its rapid cooling andsolidification, and consequently it may be formed of woven wire orperforated sheet metal, in such wlse that it can be removed from thepackage when desired. For example, a sheet of metal or woven wire,

or cylinder, and the ends of the sheet temporarily connected by clampsto form a, mold, into which the envelop is introduced, so that, when thepitch or asphalt has been poured therein and has solidified, the mold orreceptacle may be removed, leavlng the envelop sticking to thesolidified mass. If desired, the mold may be provided with a'centralcore so that the solidification of the niass will be expedited.

On the drawings,-

Figure 1 illustrates an op enwork knockdown form or mold, with the paperenvelop therein ready to receive the molten asphalt.

Fig. 2 represents a plan view of the same.

Fig. 3 represents a package of asphalt.

Fig. 4 represents another package having hoops, and shows a portion of aform with the ends secured together with twisted wire."

in plan view, a portion of temporarily by means of twisted the drawingsaform or and illustrates how the form may the bottom suitably braced, mayi mold is indicated in Fig. 1-, which consists of a sheet of woven wire10, say half inch mesh, which is bent into cylindrical form,

andwhich' is braced at its selva'ges and at itsends with straps or wirerods 11, 12, to give it the necessary strength. Clam s 13 for clampingthe ends of the sheettogether,

or, if desired, the ends of the 'sheetmay be secured by stove wire, asat 13, Fig. 5, which easily--may be cut to the form. The lowerend oftheform is permit the removal of closed by a head, 14, of any suitablemathereof and its ends brought out and clamped together by the endbraces 12 and the clamps 13, as shown in Fig. 2. The lower edges of thesheet 16 are nested within the upturned edge or flan e of the bottomsheet 15. A small quantity of the material to be shipped now may bepoured into the lined form, up to the level indieated by the line 00-mand permitted to set at the juncture of the side and bottom linings, andthen the remainder of the molten material may be poured into the formand permitted to solidify. As soon as the solidification has occurred,the wire form may be removed, leaving the envelop inclosing and adherinto the side and end of the molded mass. TVhile the mass is stillplastic, a circular sheet of paper may be pressed upon the upper endthereof, if desired.

The envelop is preferably formed of paper 17, as shown conventionally inFig. 8, which may be either Kraft or anila or the like, impregnated withan asphaltic or other suitable waterproofing composition, and having acoating or layer 18 of high-meltingpoint pitch or asphalt. Of course,instead of paper some other suitable flexible material may be used, butwe think that a fairly strong paper is the best, because of the easewith which it may be stripped from the molded asphaltic mass. From ourobservation, it would appear that, when the hot molten asphalt is pouredinto the asphaltcoated envelop, the coating is melted and fusestherewith, and on cooling sets therewith, so that, on stripping thepaper from the molded mass, the asphalt is left on the mass, the papercoming away comparatively clean. The presence of the coatin prevents thepaper from bein burned by file molten asphaltic mass on tie introductionof the latter into the envelop.

We sometimes find it convenient to leave the form on the molded andenveloped mass and thus to ship it, where the package may be subjectedto extraordinarily rough usage. v

The consumer has no difiiculty in removing the form and returning itwith others in a fiat package or in a roll form, the relativeflexibility of the material of which the form is made permitting it tobe bent into a flat sheet or to be nested together with others.

Of course, after illustrating one way in which the invention may bepractised, various changes and refinements will readily suggestthemselves to those skilled in the art. For example, a frusto conicalcore 19 of perforated or foraminous material may be placed in the formand covered with a layer 2Q of the treated paper, and, after theasphaltic mass has solidified, the core may be withdrawn. By the use ofthe core, the radiation of heat is increased and the mass more rapidlysolidified. Again, if desired, hoops 21 may be introduced into the formbefore the envelop or lining is introduced to protect the ends of thepackage, or upright strips 22 maybe placed inside the lining.

In the first case, the internal pressure causes the paper to bulgeslightly between the hoops so that they are held in place when the masssolidifies.

We secure a decided advantage by using waterproof paper, because, afterthe molten asphalt has been poured into the mold or form, the packagecan water, or passed while on trucks through a shower of water to hastenthe solidification of the plastic mass, without detriment to theenvelop, and of course the package can be exposed to the weather withoutinjury to the a er.

p aturally, instead of employing as the bottom of the form a head madeof wood, it may be made of stout wire cloth as shown be sprayed with at23, braced with stifieners 24, the ends of if desired, so long as theydo not soften too much when exposed to solar heat, and in such case thewire form is left on, for shipment. The envelop may be coated withmaterial identical with that to be packaged, but, for all generalpurposes, we prefer a high-meltin -point blown asphalt for the purpose.he Waterproofing compound with which the paper is impregnated may besimilar to that used in making commercial prepared roofing.

Various changes may be made in both the method and package hereindescribed without departing from the scope of the invention defined inthe claims, in which it will be understood that the words asphalticmaterial are intended to include pitch, tar and other like compositionswhich solidify on cooling to ordinary atmospheric temperatures.

, an adhesive, clamping vthe meeting edges of, said sheet, molding saidasphaltic' mate-- rial in said envelop, and removing said form thelining of, a removable form, clamping the meetlng edges of such sheet,and then molding said asphaltic material in said form and'envelop.

2. A method of packaging asphaltic material, which conslsts inintroducing into, and as the lining of, a-removable form, a flexiblefibrous material coated with a suitable material, and molding saidasphaltic material in said envelop.

3. A method of packaging asphaltic material, which consists inIntroducing a flexible fibrous envelop into, and as the lining 01, aremovable form, then molding said asphaltic material in said form andenvelop, and removing said form, leaving the envelop adhering to themolded mass.

4. A method of packaging asphaltic material, which consists inintroducing into, and as the lining, of. a removable form, a sheet offlexible fibrous material coated with leaving the envelop adhering tothe molded mass.

5. A method of packaging asphaltic material, which consists in lining ametallic form with an envelop of flexible sheet materialhavinganinternal surface coated with asphaltic material, introducing material,to be ackaged, in molten condition into the sald envelop, and permittingsaid mass of asphaltic material to solidify,

and adhere to the coated face of said lining.

6. A method of packagingasphaltic material, which consists in forming awrapper of flexible material coated with an asphaltic composition into atubular receptacle within a hollow mold, filling said receptacle withmolten asphalt, permitting the latter to fuse the asphaltic permittingthe same to adhere with said asphaltic composition and to cool andharden, and then removing the mold and leaving the cooled asphaltic-masswith the wrapper adherent thereto.

7. A method of packaging asphaltic material, which consists in bending asheet of flexible fibrous material-into tubular form,

confining the same within a tubular mold and clamping the meeting edgesof said sheets together, filling said tube with molten asphalt andpermitting the latter to cool and to adhere to said tube, and thenremoving said mold, leaving said cooled mass and the adherent wrapper inmarketable condition.

-8. A method of packaging asphaltic material, which consists in bendinginto tubular form a flexible fibrous wrapper having an inner layer ofasphaltic composition, inclosin said wrapper within a tubular mold andcamping the meeting edges of said Wrapper together, filling the wrapperwith molten asphalt, fusing together the said material and saidasphaltic layer, permitting said material to cool and set, and removingsaid mold.

9 A method of packaging asphaltic material, which consists in bending awrapper of flexible material into tubular form, locating a bottom formedof such material at the lower end of the tube, inclosing the envelop soformed Within a removable mold, filling said tube with molten asphalticmaterial,

to said wrapper end bottom and to cool, and then removing said mold.

In testimony whereof we have affixed our signatures.

CHESTER E. RAHR.

